Hermetically sealed bag



1943- A. B; HASLACHER ET AL 2,336,449

HERMETICALLY SEALED BAG 4 Sheets-Sheet 1 Filed July 2, 1942 V?! r fiiqaslad'wr; I" .Rohdim Dec.7, 1 94-3.

A. B. HAsLAcHER ETAL 2,336,449

HERMETICALLY SEALED BAG Filed July 2, 1942 4" Sheets-Sheet 2 How rm Min 1943- A. B. HASLACHER ET AL 2,335,449

HERMET I CALLY S EAL'ED BAG Filed July 2, 1942 4 Sheets-Sheet 3 730 7? E71 E 782' u v71 fedB.Hasl ac]ze2; owwnwz omm,

A. B. HASLACHER ET Al. 2,336,449

. HERMETICALLY SEALED BAG Filed July 2, 1942 4 Sheets-Sheet 4 fiy'red H0 in,

Patented 7, Mk3

m-lalim'ricannir seam-2n BAG Alfred B; Haslacher, New York, n.1,, and Howard a. Rohdin, Glen Ridge, N. J.

Application July 2, 1942, semi No. 449,488 13 Claims. (Cl. 229-55) Our invention relates to an improved bag of the type having an inner, heat-fusible ply and an independent outer ply of paper or other non-heatfusible, flexible material and it is the object of this invention to provide a closure for a filled bag of this type which will-permit heat sealing of the mouth of the heat-fusible ply in an optimum manner for any circumstances encountered and at the same time will yield a finished package of pleasing appearance, with the paper ply strengthening and supporting theheat-fusible:

These and other objects will be made clear from the following detailed description taken in connection with the annexed drawings in which:

Fig. 1 illustrates the treatment of the paper web preparatory to assembling and tubing it with a web of heat-fusible material;

Fig. 2 is a view of the completed tube, the tube being shown as somewhat more expanded than is apt to be the case during the actual tubing operation;

Fig. 3 is a perspective view of the open bag after it has been filled but before any of the sealing steps have been carried out;

Fig. 4 is a view illustrating the first sealing step;

Fig. 4-A shows an alternative primary seal- 8 step;

Fig. 5 is a view illustrating the disposal of the heat sealed liner mouth;

Fig. 6 is a perspective view of the completed package;

7 is a view similar to Fig.1 illustrating an alternative method of treating the paper web;

Fig. 8 is a view similarto Fig. 2 showing the effect on tube structure of the treatment illustrated in Fig. 7;

Fig. 9 is a view similar to Fig. 4 showing the disposition of the parts in the'alternative form;

Fig. 10 is a view of the final package where the pane; web has been treated in accordance with i Much work has been done in the past ten years looking toward the production of afiexible walled 1 l collapsible package capable of being hermetically sealed. The problem i complex and involves in great many factors. In importance these factors divide more or less equally between technological and economic problems. If cost were no object there would be no technological dimculty in the way of producing perfect hermetically sealed packages. Similarly, if it were permissible to compromise with p rfection of the hermetic char- Fig. 11 is a view corresponding to Fig. 7 illustrating an alternative treatment of the web following the general principles of Fig. "I;

Fig. 11-h is a perspective view showing the effect of the treatment of Fig. 1 1 in the formation of the final closure:

Fi8'.l2isaviewsimiiartomg.7showing still another alternative treatment of the web following the principles of Fig. 7; and

Fig. ,12-A is a perspective view showing how r the treatment illustrated in Fig. 12 operates in the final package closure.

acter of the seal reasonably tight packages could be produced in quantities at reasonable cost. Extreme difllcu'lty is encountered, however, when one at empts to produce a large number of perfect packages at a reasonable cost.

It cannot be too strongly emphasized that there is no problem in producing a' single perfect package or even 1,000 perfect packages. In the packaging business production necessarily runs into millions of packages. No matter what expedient be resorted to, not an of these million will be perfect. There is, however, for each size and type of package a fairly determinable maximum permissible proportion of defectives, Unless the proportion of defective packages be reduced at least to that point the project is a commercial failure and the commercial success of such a project is measured, from the profit standpoint of the manufacturer, by the extent to which the proportion of defectives is lowered below the maximum permissible proportion.

There is a real distinction between theproblem of sealing the bottom of the bag in the course of manufacture and the problem of sealing the mouth of the bag, at the plant of the user-after it has been filled. In general, the bag manufacturer uses better equipment, better supervision and better inspection than do most of the plants using the bags. Yet where hermetic sealing is required, it is immaterial at which end the failure takes place. The package is rated a failare or success depending on its performance in the hands of the user and his vendees. It is, therefore, necessary to differentiate sharply between the sealing facilities at the two ends of the package. The bottom should be arranged for the utmost facility and security in view ofvthe equip,

ment of the bag manufacturer, and the mouth'cnd should be arranged to afford the user an opportunity for making the greatest possible proportion of perfect seals with his facilities. which may range anywhere from the most expensive au- .tomatic machinery in semi-automatic or even manual closing of-the mouth end.

' Due to the exposure, however,

In the manufacture of bags the basic operation is the formation of a flattened tube. Once this is accomplished, bag lengths are severed from the tube and bottomed by any of several methods. In the tubing operation the paper or other flexible materials is continuously drawn from a roll and is flexed about an axis parallel to the length.

secured thereto, if at all, only by spots or lines of adhesive-at particular points. The superimposed webs are then tubed.

As used throughout the specification and claims, the term "paper non-heat-fusible webs and the term heat-fusible ply includes all flexible webs capable of being heat-sealed, whether such webs be formed of heat-fusible material or merely coated therewith.

In Fig. 1 we show a web of paper l8 advancing in the direction of the arrows A. Lines l2, l4 and I8 indicatewhere one set of gusset fold lines will occur in the finished bag and lines [8, 28 and 22 indicate where the other set will occur. The first step in treating the web is to form a pair of slits 24 and 28 which are in alignment and extend transverse the length of the web I8. The slit 24 extends from line l2 to line l8 and the slit 28 extends from line l8 to line 22. The next step is to form longitudinal slits running from each end of each of the transverse slits. These longitudinal slits have a length which substantially exceeds the width of the front and rear walls of the finished bag, that is, the length of the longitudinal slits exceeds by a substantial amount the distance between lines l8 and 18. These longitudinal slits, together with the transverse slits, deflnetongues 28 and 38 which are pressed out'of the plane of the-web and folded back against the web to form openings 32 and 34. In Figure l-the lineXX shows the point at which the cut off of the finished tube will occur.

This line is spaced ahead of the fold lines 38 and 38 of the flaps '28 and 38, respectively, a distance at least equal to that between lines i6 and i8.

With the web in the condition illustrated at the left end of Fig. l the web I8 is superimposed upon a web of heat-fusible material and the superim-. possed webs are then tubed in a single operation and bag lengths are severed from the continuous composite tube.

Fig. 2 illustrates a tinuous tube formed as above described. terior is formed .by the paper web I8. Flaps 28 bag length cut from the conand 38 are folded into the gussets and the openings 32 and 34 expose the. heat-fusible ply 48 at the mouth of the bag and in the area of the gussets. At the opposite end of the bag, the portions of the openings 32 and 34 lying ahead of the cut off line X-X serve to exposeportions of the heat-fusible ply 48 in the area of the gussets adjacent the end of the bag which is to be closed to form its bottom. I

The precise form of bottom is immaterial so far as our improved mouth structure is concerned.

The exof the heat fusible includes all flexible,

ply at the bottom end it will frequently be convenient to form the bottom by a simple application of heat and pressure transverse the bag and in the area of the exposed heat-fusible ply. This will form a completely heat sealed fln which may be folded against and secured to either wall of the bag.

In Fig. 3 we show the mouth of a filled bag. As illustrated here, flaps 28 and brought up. into a plane normal-to the axis of the bag. For optimum'results this should coincide as nearly as possible with the level of the contents. For reasons set. forth hereinafter,

however, our arrangement of flaps will produce an effectual and sightly package even though the level of the contents should lie substantially above this plane. It is to be understood that representation of the flaps as in this plane is for clarity of illustration and that in practice the flaps may, if desired, be bent below the plane. It is to be noted that the upper portions of the front and rear paper walls lying above the fold lines 38 and 38 respectively form fiaps 4| and 43. These flaps 4| and 43 are pulled away from the heat-fusible ply 48 in the same manner as flaps 28 and 38, and leave the mouth of the heat-fusible ply completely accessible for the formation ofany desired type of heat seal.

One such type is illustrated in Fig. 4 in which the mouth of the heat-fusible ply 48 has been drawn out and collapsed to form a fin 42 which may be subjected to heat and pressure toform a seal. The fin 42 may then be folded down into the plane occupied by flaps 4| 'and 43 and portions of the fin 42 which project beyond the cross section of the filled bag may be mutually superimposed so as to lie'wholly within the cross section, as illustrated in Fig. 5. The closure is then completed by superimposing the various paper flaps.

In Fig. 4 the two lines BB indicate, the amount by which the flaps 4| and 43 exceed the length necessary to cover the cross section of the bag and the portions of these fiaps lying outside the lines B-B may optionally be either folded out of the way or trimmed. The lines C-C similarly indicate the amount by which the flaps 28 and 38 exceed the width of. the front and rear walls. ,It is to be noted that the flaps 28 and 38 are longer than the equivalent flaps formed of the front and rear walls, irrespective of the proportions of the bag. The excess length is, strictly speaking, essential on only one of these fiaps. on both flaps, however, to avoid any necessity for orienting the package inthe filling and closing process. 1

Figs. 5 and 6 show the final closing steps when the fin type of seal is applied to the heat-fusible ply. The projecting portions of the front and rear walls, with the excess material either trimmed or folded out of the way, are mutually superimposed on the previously folded inner ply.

- each other by the application of ordinary adhesive. Flap 38 is then superimposed on the cross section of the bag, the excess length of flap 38 havingbeen either trimmed or folded out of the way. This fiap may, if desired, be adhered to the previously superimposedpaper flaps. The flap 28 is then folded. across the top of the bag and the excess material 44 is folded down against the opposite wall and adhered or otherwise secured thereto. This forms an exceptionally strong closure and gives complete'suppc" forv 38 have been It is supplied strong than the outer paper ply.

'In Fig. .-A we have illustrated a difierent form of closure for the inner ply. In Fig. 4A the gussets of the inner ply have been reformed to collapse the front and rear walls into a single plane and the paper of the front and rear walls has been permitted to follow the front and rear walls of. the heat-fusible ply. Thisis advantageous for certain types of heat-fusible material which aresumciently delicate so that the interposition of the paper of the front and rear walls between the source of heat and pressure is needed to protect thematerial of the inner ply. When, by means of heat and pressure, a seam has been formed across the upstanding portion Ell formed by the collapse of the bag mouth, the portion 50 is folded one or more times and brought into the L plane of the contents of the bag. Flaps 28 and 30 are then mutually superimposed and the final package has precisely the external appearance illustrated in Fig. 6.

The importance of having suiiicient material in the final closing flap to extend entirely across the top of the bag and down over one of the vertical walls depends on the application to the problem of merchandisingof certain psychological principles. If the final closing fiap should extend only partly across the top of the bag the package would be unsightly. When, however, the final fiap forms a lip over the extremity of one vertical wall it is not unsightly and its appearancevalue is not altered by minor variations in the depth of the lip on the vertical wall caused by variations in the load line. These variations would be equally present if the fiap extended partly across the top of the bag but in such case.

variations would contribute to unsightliness,

' since the gap between the end of the flap and the adjacent vertical wall will always appear to be due to faulty package design, whereas with the lip on the vertical wall the gap between the edge of the lip and the bottom of the bag clearly is intentional and minor variations in the depth. of the lip do not afiect the appearance. It is particularly to be noted that by bringing a closure flap entirely across the mouth of the bag there is produced a smooth surface completely devoid of projections and leaving an unbroken space'for printing. This smooth top further contributes to the appearance of the packages as a matter of shelf display and clearly improves their stacking qualities. These effects all contribute very materially to the merchandising value of the package.

In Fig. 7 we show an alternative treatment of a, paper web I89 preparatory to tubing. In this figure lines I92, Illd and I86 indicate the location of the gusset folds for one set of gussets, and

lines I08, ilfl and H2 indicate the opposite set of gusset folds. The web is continuously advanced in the direction of'the arrows D. As a first step there is formed in the web a transverse slit in! running between lines m2 and I06. Simultaneously a transverse slit '5, aligned with the slit H5, is formed running between lines I08 and 2. A pair of longitudinal slits He then are formed, lying on lines I32 and W6 and extending rearwardly from the ends of slit I, while simultaneously another pair of longitudi nal slits I2ll'is formed coincident with lines I08 and H2 and runningrearwardly from the extremities of slit H6. The length of slits H8 and I28 is a matter of choice, within certain limits 75 that die cutting, with removal of a completely enr 2,330,440 3 p the inner heat-fusibleply which, usually, is less which will be made clear when. the function of these slits is discussed'hereinafter'.

The'next step is to form a short transverse slit I22 at the rearward end of each of the slits II! '6 and simultaneously to form similar transverse slits I24 at the rearward ends of the slit I2.

I The slits I22 are. parallel to the slit Ill and extend beyond the ends of the slit I at each end thereof, and the transverse slits I24 have a simil lar relationship with the transverse slit H6.

The next step is to form longitudinal slits I26 running rearwardly from the outer extremities of the transverse slits I22 and simultaneously to form a similar pair of longitudinal slits I28 running rearw'ardly from the outer extremities of the transverse slits I24. The combination of transverse slits H4 with longitudinal slits H8, transverse slits I22 and longitudinal slits- I26 is to define a flap or tongue I30, while a similar tongue I32 is formed by the other set of slits.

These tongues are struck up out of the web as a it advances and are folded back against the web,

which is then superimposed upon a web of heatfusible material and the twowebs are then tubed I together. At the base or fold line of each tongue slits I23 are formed parallel and equal to the "transverse slits I22 and I24. Consecutive bag lengths are cut off along a line Y-Y- which lies between the shoulder formed by slits I I8 and I24 and the fold lines of tongues I30 and I32.

In Fig. 8 we show a completed bag length be fore the bottoming operation. For purposes of illustration the bag length is shown somewhat expanded, though it will be understood that in 35 practice the bag length is completely flattened.

-The turning back of the tongues I30 and I32 exposes, at the mouth end'of the bag, a portion 4 of the heat-fusible ply I50 and the area, of ex-' posure includes the full width of the gusset at 40 the mouth end and a portion of the front and rear faces at the margins thereof. On the front face, which .is visible in Fig. 8, these portions lie respectively between the slit I26 and the gusset fold line I86, and the slit I28 and the gusset fold 15 line I08. At the bottom of the bag the inner ply I is exposed, through the area of the gussets,

between the extremity of the bag and the transverse slits H4 and H6. There Is also exposed the lower corners of the front and rear faces in the 50 areasvdefined by slits I22 and II B at one corner and I28 and Iifl'at the opposite corner. It is within the purview of our invention either to have the line of cut oil YY of Fig. 7 coincident with slits I22 and 824, in which case there will be no exposure of the inner ply'on the front and rear walls at the bag bottom, or'we may provide slits complementary respectively to slits H8 and I22 and slits I20 and I24 so as to remove as by a diecutting operating the material forming the tabs outlined by slits I I8 and I22 and slits I20 and I24.

In this .case the depth of the exposure -of the front and rear faces of the inner ply at the front and rear walls at the bottom of the bag will be coextensive with the lengthof exposure of the inner ply in the gusseted walls. -We prefer so to proportion the various slits that the line of cut oil Y-Y may be made coincident. with the short transverse slits and thus to avoid any exposure of the front and rear faces of the inner ply at the 7 bottom of the bag; The die-cutting step may be desirable in order to simplify the problem of equal application of pressure to the formation of a heat sealed bottom of the filled type, although this will not usually be preferred due to the fact 204 and 206.

closed piece of material, particularly of small dimensions, is somewhat diificultto accomplishat high web speeds. If the line of cut off Y-Y be made coincident with the slits I22 and I24, as

stated, there will be no exposure of the inner ply of the front and rear walls at the bottom of the bag, and this maybe advantageous in forming certain types of bottoms.

Fig. 9 corresponds generally with Fig. 3 and illustrates how the. entire mouth of the heat fusible ply I50 is exposed by the folding down of flaps I30 and I32 from the gusseted walls and flaps I3I and I33, which are formed of the material of the paper ply of the front and rear walls above the fold lines of the flaps I30 and I32. Lines E-E indicate the line of excess mais then superimposed overfiaps I3I and I33, and

fiap I32 is then brought over all of the other flaps and its lip I34 is folded against and secured to the opposite gusseted wall, while auxiliary flaps I32, consisting of the portions of paper removed from the front and rear walls, are folded against and secured to the front and rear walls, respectively. Because it is convenient in most cases not to be obliged to orient the bag to any particular position, flaps I30 and I32 have been shown as identical but clearly this is not essential so far as the production of a perfect package is concerned and either flap I or flap I32 could be made only as wide as the gusseted wall from which it is struck and would, therefore, be precisely equivalent to flaps 28 and 30 of Figs. 1 through 6.

In Fig. 11 we show a web set of gussets therein by lines 202, 204, and 206, while lines 208, 2I0 and 2I2 indicate the fold lines of the other set. The web 200 advances in the direction of the arrows E and during such advance, as a first step, a transverse slit 2 is formed across and extended slightly beyond lines Longitudinal slits 2I8 are then formed extending rearwardly from the extremities of the slit 2 I4, and an auxiliary pair of longitudlnal slits 220 are formed extending rearwardly from the slit 2I4 and coincident with lines 202 and 208. Short transverse slits 222 are then formed at the rearwardextremities of the slits 2I8 and extend inwardly from such extremities respectively to lines 202 and 208. The slits2I8 exceed in length the width of the front and rear walls of the completed bag, that is, they exceed the distance between lines 208 and 208. The slits 220 in most cases will have a lengthequal only to the amount by which the length of slits 2I8 exceeds the width of the front and rear faces. j

Simultaneouslywiththe formation of the slits above described a similar set of slits, indicated generally by the numeral 224, is formed to over- .lie lines 208, 2I0 and 2I2 in the same manner as the above-described set of slits overlies lines 202,204 and 208. a

The next step is to turn back a tongue 220 defined by the first described set of slits and a tongue 228 defined by the second set of slits .224. The web 200 is then superimposed upon a web .of heat-fusible material and the two webs are 200 and indicate one cured to the vertical wall.

simultaneously tubed as heretofore described with referenceto other forms.

In Fig. 11-A we show a package in which the paper web has been treated in accordance with Fig. 11 and have illustrated particularly the final closing step. The mouth of the heat-fusible ply has been sealed and folded into place and only flap 228 remains to be secured. This fiap is drawn across the top of the bag. It is to be noted that the portion 221 of the flap 228 lying between the slits 220 forms a lip which may be bent over the vertical wall of the bag and the portions229 of the flap 228 lying outside the slits 220 form tongues which may be folded either under or over the portion 221 and suitably secured thereto.

In Fig. 12 we show a paper web 300 advancing in the-direction of the arrows F. On this web we have indicated the fold lines for one set of gussets by lines 302 304 and 308, while lines 308, 3I0 and 3I2 indicate the other set. During the advance of the web 300 we first form a transverse slit 3 extending across and slightly beyond lines 302 and 306. We then form, running rearwardly from the extremities of slit 3I4, a pair of longitudinal slits 3I8 These slits are of a length substantially exceeding the width of the front and rear wa1ls,'that is, substantially exceeding the distance between lines 306 and 308.' At the rearward extremities of lines 3I6 we form a pair of transverse slits 3I8 which run from the extremities of the slit 3; respectively to lines ,302 and 308, and we also form, spaced rearwardly from slit 3I4, a pair of transverse slits 320 which are precisely similar to transverse slits 3I8. The transverse slits 320 I are spaced from the transverse slit 3I4 a distance substantially equal the amount by which the length of slits 3I6 exceeds the width of the front and rear walls.

Simultaneously with ithe formation of the set of slits above described we form a similar set of slits indicated as 322 and bearing the same relationship to lines 308, 3I0 and 3I2 as the above talezcrlbed set of slits bears to lines 302, 304 and As the web 300 continues to advance a tongue 324 defined by the first described set of slits is struck out of the web and folded back against the web, while a tongue 328 defined by the set of slits 322 is similarly struck out. The web 300 is then superimposed upon a web of heat-fusible material and the superimposed webs are simultaneously tubed. In Fig. 12--A we illustrate the final step of closing a package formed from a web treated in accordance with Fig. 12. As a final step the tongue 324 has been drawn over the top of the package and its extremity 325, which has a width equal to the amount by which the length of flap 324 exceeds the width of the front and rear walls may be bent down and suitably se- Due to the formation of slits 320 there are provided lateral tongues 325' at each extremity of the flap 325 and these may be bent against the adJacent vertical walls so as to either overlie or underlie the lateral margins 323 of the flap 324 which are similarly folded against their adjacent vertical walls. As in the case of theshort lateral flaps illustrated in Figs. 11.A and 12-A, the P ychological principle abovediscussed with reference" to Figs. 6-A

and 10 are fully complied with, even though these short flaps remain on .the exterior of the package.- The length of these fiaps in reference to the width of the walls against which they are folded does not change with variations in the level of the contents and. therefore, a finished, uniform appearance will always be obtained In general,

however, a smoother appearance will be had if these short fiaps are always bent under fiaps extending the entire width of the face against which the short flaps are bent.

- to be limited by the structural details disclosed It is to be understood in connection with the a treatment of the paper web illustrated in Figs. 1,-

.7, 11 and 12 that it is entirely optional either to carry out the illustrated treatment as part of the.

bag making operation, or, where pre-printing is strued.

done, to carry out the special treatment asa part of the printing operation, in which case the treated and printed web will be rewound before being taken to the bag machine.

In connection with all of the various forms illustrated it is to be noted that the 'fiaps formed from the material of the gusseted walls are so related to the line of cut oil? that the total length of each flap exceeds the width of thefront and rear walls so as to permit complete coverage of the upper end of the bag. It is also clear that,

due to the fact that the line of cut off X- X in Fig. 1 and Y-Y in Fig. 7 lie intermediate the extremities of the opening formed by the turningback of the tongues, the tongues will always exceed in length the adjacent portions of the front and rear walls, both of the paper ply and of the heat-fusible ply. The advantage of this has been previously discussed in connection with the appearance of the bag. There is, however, a further advantage attained by our method of striking tongues from the web before the tubing operation. As a rule the material of the heatfusible ply is far more expensive than the paper forming the outer ply. By our method and the design of our package we securean additional tageous so far as machine operations are concerned.

It is to be understood that our invention is not in this specification but only as set forth in the sub-joined claims which are to be broadly con:

What is claimed is:"

1. A bag comprising a flattened tube of flexible materialhaving front and rear walls, gusseted side walls and a closure at one end; said tube comprising an outer ply of paper and an independent inner ply oi heat-fusible material; the paper ply, at the open end, being slitat the edges of the front and rear walls downwardly from the mouth of the bag for a distance sub-' stantially exceeding the width of the front and rear walls and to a point approximating the inlength of paper Where it is needed at the mouth of the bag without being obliged to sacrifice an equivalent amount of the expensive heat-fusible material.

The limiting factors on the length or slits H8 and I 22 are based, first, on the requirements of appearance in the finished'package and, second,

on the requirement for paper in forming the bag bottom. This latter factor depends on the type of bottom to be formed and selection of precise dimensions in any particular case is a matter for the skill and experience of the bag'manufaoturer.

While we have emphasized the sealing of the mately to the intendedload line of the bag when filled.

4. A bag formed from a flattened tube of flex-- mouth of the inner ply by taking advantage of" its inherent heat-fusible characteristics, it is entirely possible for some purposes to close the mouth. by the application of a'suitable type of adhesive tape. In addition, while we have for the most part emphasized that the inner ply is not secured to the outer ply, such securement may be desirable for some purposes as, for example, the two plies may be secured together around the line of the intended level of the contents and for the formation of certain types of closures it may be desirable to secure the paper ply to the heati'usible ply adjacent the upper extremities of the front and rear walls of the paper ply. This would be particularly desirable in connection with the formation of a closure as illustrated in Fig. 4-A.

Although we have described our process as involving a particular sequence of steps, the sequence is not essential to our inventive concept and all of the steps incident to the treatment of the web could be carried out simultaneously without departure from our inventive concept. In practice, however, it is probable that the sequence as set forth herein will be found the most advantended load line of the bag when filled, said paper ply being secured to said heat-fusible ply only at the front and rear walls adjacent the extremity of the paper ply.

2. A bag comprising a flattened tube of flexible material having front and rear walls, gusseted side walls and 'a closure at one end; said tube 3. A bag formed from a flattened tube of flex-- ible material having front and rear walls, gusseted side walls, and a closure at one end; said tube being formed of an outer ply of paper and anindependent inner ply of heat-fusible material; the paper ply at the open end of said tube being slit along lines parallel to the gusset fold lines and extending downwardly from the mouth of the bag a distance substantially exceeding the width of the front and rear walls and approxiible material having front and rear walls, gusseted side walls and a closure at one end: said tube being formed of an outer ply of paper and an independent inner ply of heatfusible material; the paper ply at the open end oi said tube beingslit alonglines parallel to the gusset fold lines and extending downwardly from the mouth of the bag a distance substantially exceeding the width or the front and rear walls and approximately to the intended load line of the bag when filled, one pair of said slits being spaced inwardly from the margins ofadjacent edges of the front and rear walls. 1

5. A bag formed from a flattened tube of flexible material having front and rear walls, gusseted side walls and a closure at one end; said tube being formed or an outer ply of paper and an independent inner ply of'heat-fusible material; the paper ply at the open end of said tube being slit along lines parallel to the gusset fold lines and extending downwardly from the mouth of the bag adistance substantially exceeding the width of the front and rear walls and approximately to the intended load line of the bag when filled. one pair of said slits being spaced inwardly from the margins of adjacent edges of the front and rear walls, said paper ply being secured to said heat-fusible ply only at said closure and adjacent the mouth of the bag on said front and rear walls.

6. A bag formed from a flattened tube of flexible material having front and rear walls, gusseted side walls and a closure at one end; said tube being formed of an outer ply of paper and an independent inner ply of heat-fusible material; the paper ply at the open end of said tube being slit along lines parallel to the gusset fold lines and extend-' ing downwardly from the mouth of the baga disstance substantially exceeding the width of the front and rear walls and appropriately to the intended load line of the bag when filled; one pair of said slits being spaced inwardly from adjacent 1 flattened tube of flex- I paper ply at the open end of said tube being slit along lines parallel to the gusset fold lines and extending downwardly from the mouth of the bag a distance substantially exceeding the width of the front and rear walls and approximately to the intended load line of the bag when filled, said slits being spaced inwardly from the margins of the front and rear walls, said paper ply in the area of the gussets being substantially longer than the corresponding portion of said heat-fusible ply, that portion of the paper ply in the area of the gussets and coextensive with said slits being folded back against the adjacent portion of the paper ply.

8. A tubular blank for formation into a bag comprising an inner ply of heat-fusible material and an independent outer ply of paper, said plies being formed into a tube having front and rear walls and gusseted side walls, the Paper ply in the area of the gussets being longer than the heatfusible ply at one end of the blank and being correspondingly shorter than said heat-fusible ply at f the opposite end of the blank.

9. A bag comprising an inner ply of heat-fusible material and'an independent outer ply of paper, said plies being formed into a. tube having front and rear walls and'gusseted side walls, the paper ply in the area of the gussets being, at the mouth end of the bag, longer than said heat-fusible ply and at the opposite end of the bag correspondingly 55 shorter than said heat-fusible Ply; the bag at said last named end being closed by a heat sealed seam to form a fin and said fin being folded against and secured to one wall of the bag.

10. A bag comprising an inner ply of heatfusible material and an independent outer ply of paper, said plies being formed into a tube having front and rear walls and gusseted side walls, the paper ply in the area of the gussets being, at the mouth end of the bag, longer. than the said heatfusible ply and at the opposite end of the bag correspondingly shorter than the said heat-fusible ply, the bag at said last named end being closed paper ply being slit to form tongues adjacent'themouth of the bag, the tongues overlying the gussets being folded back upon the adjacent portion of said paper ply; said tongues being longer than the remaining paper between s'lits.

1 2. A bag comprising a flattened tube havin front and rear walls and gusseted side walls and being formed of an outer ply of paper and an independent inner ply of heat-fusible material; said paper ply being for a short distance at its paper ply being slit to slit to form tongues adjacent the mouth of the bag, the tongues overlying the gussets being folded back upon the adjacent portion of said paper ply; said tongues being longer than the remaining paper between slits, at least one of said tongues exceeding its adjacent gusset in width.

13. Abag compris g a flattened tube havin front and rear walls and gusseted side wallsand being formed of an outer ply of paper. and an independent inner ply of heat-fusible material; said form tongues adjacent the mouth of the bag, the tongues overlying the gussets being folded backupon the adjacent portion of said paper ply; said tongues being longer than the remainingpaper between slits, at least one of said tongues exceeding its adjacent gusset in width for a length equal to the width of the front and rear walls and being equal in width to said gusset free end. ALFRED B. HASLACHER. HOWARD A. ROI-IDIN. 

